层间距对热还原氧化石墨烯超级电容器性能的影响
The Influence of the Interlayer Distance on the Performance of Thermally Reduced Graphene Oxide Supercapacitors.
作者信息
Lin Jun-Hong
机构信息
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan.
出版信息
Materials (Basel). 2018 Feb 8;11(2):263. doi: 10.3390/ma11020263.
In this paper, cationic surfactant cetyltrimethylammonium bromide (CTAB) was employed to prevent the restack of the thermally reduce graphene oxide (TRG) sheets. A facile approach was demonstrated to effectively enlarge the interlayer distance of the TRG sheets through the ionic interaction between the intercalated CTAB and ionic liquids (ILs). The morphology of the composites and the interaction between the intercalated ionic species were systematically characterized by SEM, SAXS, XRD, TGA, and FTIR. In addition, the performance of the EDLC cells based on these TRG composites was evaluated. It was found that due to the increased interlayer distance (0.41 nm to 2.51 nm) that enlarges the accessible surface area for the IL electrolyte, the energy density of the cell can be significantly improved (23.1 Wh/kg to 62.5 Wh/kg).
在本文中，使用阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）来防止热还原氧化石墨烯（TRG）片层的重新堆叠。通过插层的CTAB与离子液体（ILs）之间的离子相互作用，展示了一种简便的方法来有效扩大TRG片层的层间距。通过扫描电子显微镜（SEM）、小角X射线散射（SAXS）、X射线衍射（XRD）、热重分析（TGA）和傅里叶变换红外光谱（FTIR）系统地表征了复合材料的形态以及插层离子物种之间的相互作用。此外，还评估了基于这些TRG复合材料的双电层电容器（EDLC）的性能。结果发现，由于层间距增加（从0.41纳米增加到2.51纳米），扩大了IL电解质可及的表面积，电池的能量密度可显著提高（从23.1瓦时/千克提高到62.5瓦时/千克）。
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